I'm commisioning one of the smoothie boards I got during the group delta purchase early this year. I got the 1.0a board, the GLCD adapter and 5V regulators for the Smoothie and adapter, and the GLCD itself from Uberclock. I have several of these GLCDs to test with. All of them are incredibly dim on the above setup (new smoothie, GLCD adapter) and I thought the vreg might be the issue so I tested it and it works fine.
On my first smoothie I made my own harness for the GLCD. I don't recall it being so dim but its been awhile and I can't check now. The same GLCDs on other printers is nice and bright but moved over to my smoothie, it is almost impossible to read. I tried setting Contrast in the menu settings but it doesn't "stick" (i.e. the contrast always resets to 0. Perhaps that's the issue?